Geological Society and A. A. A. S. MeetiiKjs. — VphiOH. 239 
Cretaceous Plants from Martluis Vineyard. Residts obtained from 
an examination of the material collected by David White in 1889. Ar- 
thur HoLLiCK, New Brighton, N. Y. At the Nev York meeting of this 
Society in December, 1889, Mr. David White read a paper on this sub- 
ject which was published in abstract in the proceedings of that meet- 
ing. Mr. White subsequently published a more extended account in 
the American Journal of Science for February, 1893, and figured a few 
of the speciaieus which were most readily to be identified as Cretaceous 
species. These papers were based upon material collected by him and 
Mr. Lester F. Ward during the summer of 1889. Their object was prin- 
cipally to demonstrate the occurrence of Cretaceous strata in that is- 
land, hence only sufficient material for that purpose was utilized. 
During the present year all the material which was collected has been 
turned over to Mr. Hollick for examination and report, in addition to 
which are a few specimens which he collected in 1893. All these col- 
lections indicate a flora parallel with that of the Amboy clays in New 
Jersey. The fossil leaves are found in concretionary sandstones which 
occur with the clays of Martha's Vineyard in somewhat uncertain rela- 
tions; so that it is very desirable, if possible, to obtain such fossils also 
in the clays. The difficulty of preserving the leaf impressions hitherto 
found in the clays has prevented their study. 
On the Eocene Fauna of the Middle Atlantic Slope. William B. 
Clark, Baltimore, Md. According to the author's studies, the Eocene 
fossils of New Jersey and the country southward to North Carolina 
should not be referred, as formerly has been done, to one, or a part of 
one, of the seven divisions of the Eocene based on the Gulf localities. 
The glauconitic beds were of slow but continuous growth, notVjurdened 
with detritus, and 200 feet of this greensand formation may easily be 
the time equivalent of 2,000 feet of Gulf deposits. Prof. Clark has 
found 120 species of fossils instead of the previously known 25, and they 
generally range well through the whole of the series from Vjottom to top, 
though some are characteristically lower or upper. They agree well 
with those found in both the Lignitic and the Claiborne beds, at least: 
and many of them probably endured through the entire Eocene period. 
Arrangement and Developme nt of Plates in the Melonitidw. R. T. 
Jackson and T. A. Jaggar, Cambridge, Mass. This paper consisted 
in a statement of the arrangement of the plates in these spheroidal ech- 
inoderms, and especially of the way in which new rows of plates are in- 
troduced and die out. Whereas it had formerly been supposed that in 
the interambvilacral areas new rows of plates originate near either pole, 
and spread meridionally, meeting in the equator. Dr. Jackson showed 
that new rows originate near the oral pole only, often in a heptagonal 
plate, the rest of the plates being six-sided; that the rows are extended 
toward the genital plates at the aboral pf)le, where the crowding of the 
plates gives them an irregular arrangement; and that new rows are in- 
troduced alternately upon the right and left sides of the interambulac- 
ral area, beginning near the oral pole and near the central meridian of 
